2-substituted-3-disubstituted-4,5,6,7-substituted or unsubstituted phthalimidines

ABSTRACT

1. A COMPOUND OF THE FORMULA,   1-(O=),2-R5,3-Q,3-Z,4-R4,5-R3,6-R2,7-R1-ISOINDOLIDINE   WHERE R1 IS HYDROGEN, LOWER ALKOXY, HALO HAVING AN ATOMIC WEIGHT OF 19 TO 36, OR TRIFLUOROMETHYL, R2 IS HYDROGENM LOWER ALKYL, LOWER ALKOXY, HALO HAVING AN ATOMIC WEIGHT OF 19 TO 36, TRIFLUOROMETHYL, NITRO OR AMINO, R3 IS HYDROGEN, LOWER ALKYL, LOWER ALKOXY, HALO HAVING AN ATOMIC WEIGHT OF 19 TO 36, TRIFLUOROMETHYL, NITRO, AMINO, DIALKYLAMINO OR PHENYL, R4 IS HYDROGEN, LOWER ALKYL, LOWER ALKOXY, OR TRIFLUOROMETHYL, R5 IS HYDROGEN, LOWER ALKYL, PHENYL, ALLYL, BENZYL, HYDROXYETHYL, CARBAMOYLOXY, OR CARBETHOXYMETHYL, OR R1 AND R2 AND R3 AND R4, TOGETHER ARE METHYLENEDIOXY, Q IS   -C(-R6)(-R7)-R8   WHERE R5 AND R6 ARE EACH INDEPENDENTLY METHYL OR ETHYL, OR R6 AND R7 TOGETHER ARE --(CH2)N-- WHERE N IS 4, 5, OR 6, R8 IS METHYL, VINYL OR ALLYL, OR   -C(-CH3)=R9   WHERE R9 IS LOWER ALKYL, Z IS HYDROXY, AMINO, LOWER ALKOXY,   OR -NH-CH2-CH2-N(-R10)-R11   WHERE R10 AND R11 ARE INDEPENTENTLY LOWER ALKYL, PROVIDED THAT (1) NO MORE THAN TWO OF R1, R2, R3 OR R4 ARE OTHER THAN HYDROGEN, (2) WHEN EITHER OF R1 AND R3 IS HALO, THE OTHER OF R1 OR R3 IS NOT HALO, (3) ONLY ONE OF R1 AND R3, OR R2 AND R4 IS ALKOXY AT ONE TIME, (4) THERE ARE NO TWO TRIFLUOROMETHYL GROUPS ON ADJACENT CARBON ATOMS, (5) ONLY ON OF R2 OR R3 IS NITRO OR AMINO, (6) WHEN Z IS HYDROXY AND Q IS T-BUTYL, THEN R1, R2, R3, R4 AND R5 ARE NOT HYDROGEN.

Z-SUBSTITUTED 3 DISUBSTITUTED-4,5,6,7-SUB- OR UNSUBSTITUTEI) PHTHALIM- William J. Houlihan, Baden, Austria, and Jelfrey Nadelson, Lake Parsippany, N.J., assignors to Sandoz- Wander, Inc., Hanover, NJ.

No Drawing. Continuation-impart of abandoned application Ser. No. 126,272, Mar. 19, 1971. This application Mar. 7, 1972, Ser. No. 232,615

Int. Cl. C07d 27/50 US. Cl. 260-325 24 Claims ABSTRACT OF THE DISCLOSURE 2 Substituted-3-disubstituted 4,5,6,7 substituted or unsubstituted phthalimidines, e.g., 3-t-butyl-5-chloro-3- hydroXy-Z-methylphthalimidine prepared by treating a substituted or unsubstituted N-substituted 2 lithioenzamidelithium salts with a substituted acetylhalide. The compounds are useful as minor tranquilizers/ sedative hypnotics.

This application is a continuation-in-part of application Ser. No. 126,272, filed Mar. 9, 1971, now abandoned.

This invention relates to 2,3 substituted-4,5,6,7-substituted or unsubstituted phthalimidines. More particularly, it relates to 2 substituted-3-disubstituted-4,5,6,7-substituted or unsubstituted phthalimidines, intermediates thereof and to processes for their preparation.

The compounds of this invention may be represented by the following structural formula:

where R, is hydrogen, lower alkoxy having 1 to 4 carbon atoms, e.g., methoxy, ethoxy, propoxy, isopropoxy, butoxy or isobutoxy, halo having an atomic weight of 19 to 36, or trifiuoromethyl;

R is hydrogen, lower alkyl having 1 to 4 carbon atoms, e.g., methyl, ethyl, propyl, ispropyl, butyl or isobutyl, lower alkoxy as defined above, halo as defined above, trifluoromethyl, nitro or amino;

R is hydrogen, lower alkyl as defined above, lower alkoxy as defined above, halo as defined above, trifluoromethyl, nitro, amino, dialkylamino wherein alkyl is as defined above or phenyl;

R is hydrogen, lower alkyl as defined above, lower alkoxy as defined above, or trifiuoromethyl;

R is hydrogen, lower alkyl as defined above, phenyl,

allyl, benzyl, hydroxyethyl, carbamoyloxy, or carbethoxymethyl; or

R and R R and R or R and R together are methylenedioxy,

Q is

It, Where R and R are each independently methyl or ethyl; or

R and K; together are (CH where n is 4, 5 or 6; R is methyl, vinyl or allyl, or

United States Patent 0 "ice 3,849,438 Patented Nov. 19, 1974 where R, is lower alkyl having 1 to 4 carbon atoms, as defined above; Z is hydroxy, amino, lower alkoxy as defined above, or

R10 NHCH2CH N where R and R are independently lower alkyl as defined above, provided that (1) no more than two of R R R or R are other than hydrogen;

(2) when either or R or R is halo, the other of R or R is not halo;

(3) only one of R and R or R and R is alkoxy at one time;

(4) there are no two trifiuoromethyl groups on adjacent carbon atoms;

(5 only one of R or R is nitro or amino;

(6) when Z is hydroxy and Q is t-butyl, then R R R R and R are not hydrogen.

The compounds of formula (I) where Z is hydroxy (Z) (Ia) may be prepared by the following reaction scheme A:

a t R1 t RP agg rmnde R2 0 R5 R3 V R NHz R3 g l Z0 Q R4 Z Q, (II) wherein R R R R R Q, Z and the provisos have the above stated significance.

The compounds of (Ia) may be prepared by treating a compound of formula (II) with an acid halide (III) such as thionyl chloride, phosphorous pentachloride, thionyl bromide and the like in an inert solvent such as benzene, ether, methylene dichloride and the like and then treating the resulting adduct with a compound of formula (IV). The reaction may be carried out at a temperature of from 0 C. to the reflux temperature of the solvent, preferably 25 C. to the reflux temperature, for about 1 to 3 hours, preferably about 2 hours. Neither the solvents nor the temperature used are critical.

The compounds of the formula (Ia) may also be illustrated by their tautomeric equivalent such as represented by the following structural formula:

1 8 (lat) wherein R R R R R Q and the provisos have the above-stated significance.

In order to simplify this description, however, formula (Ia) only will be used. It should be nevertheless understood that the compounds of formula (lat) may be represented as well as the compounds of formula (Ia) and the two tautomeric forms are within the concept of the present invention.

The compounds of formula (I) where Z is amino (2') and R R R R R Q and the provisos are as stated above (Ib), may be prepared by the following reaction scheme B, wherein a compound of formula (Ia) in the first step is treated with an acid halide (III). Inert aromatic solvents such as benzene, toluene, Xylene and the like may be used. Reaction temperatures may be from 3 about 50 to 175 C. preferably 75 to 150 C., and if a solvent is used from about 50 to the reflux temperature of the solvent, preferably at the solvent reflux temperature. Reaction times are from about 1 to 10 hours preferably 2 to hours. The resulting adduct is treated in the second step with saturated ammonia in an inert solvent such as benzene, tetrahydrofuran, methylene chloride and the like at from about room temperature to the reflux temperature of the solvent, preferably at room temperature for about 1 to 24 hours. Neither the solvents nor the temperatures used are critical.

The compounds of formula (I) where Z is lower alkoxy having 1 to 4 carbon atoms (Z") and R R R R R and Q are as defined above (Ic) may be prepared by the following reaction scheme C, wherein a compound of formula (la) in the first step is treated with an acid halide (III). Inert aromatic solvents such as benzene, toluene, xylene and the like may be used. Reaction temperatures may be from about 50 to the reflux temperature of the solvent, preferably at the solvent reflux temperature. Reaction times are from about 1 to hours preferably 2 to 5 hours. The resulting adduct is treated in the second step with a lower alkanol (V) having 1 to 4 carbon atoms such as methanol, propanol, isobutanol and the like at from about room temperature to reflux temperature of the alkanol, preferably at room temperature for about 1-24 hours. Neither the solvents nor the temperatures used are critical.

The compounds of formula (I) where Z is u wherein R and R are as defined above, and R R R R R and Q are as defined above (Id) may be prepared by the following reaction scheme D, wherein a compound of formula (Ia) in the first step is treated with an acid halide (III) using the solvents and under the reaction conditions described in reaction scheme C. The resulting adduct is treated in the second step with a substituted amine of the formula:

10 H2N CH3 CHzN Rn I) wherein R and R have the above-stated significance. When the amine of formula (VI) is not liquid, an inert solvent such as benzene, methylene chloride and the like must be used. Reaction temperatures may be from about 15 to 150 C., or if a solvent is used from C. to the reflux temperature of the solvent. The convenient temperature is about 20 to C. Neither the sovents nor the temperatures used are critical.

The compounds of formula (Ia) where R is lower alkyl, or phenyl (R (Ia may also be prepared by the following reaction scheme A wherein R R R R R Q and Z and the provisos ,4 atomic weight of 35 to 80, or --OR where R is methyl or ethyl.

The compounds of formula (Ia may be prepared by treating a compound of formula (VII) with a compound of formula (VIII) in an inert solvent such as diethyl ether, tetrahydrofuran, hexane, heptane or the like, in the presence of an inert gas, e.g. nitrogen, helium or argon and then subjecting the reaction mixture to conventional hydrolysis, preferably with aqueous ammonium chloride. The reaction may be carried out at a temperature of from 60 to -40 C., preferably 55 to 45 C., for about 1 to 3 hours preferably about 2 hours. Neither the solvents nor the temperatures used are critical.

The compound of formula (Ib) where R is as defined above (lb may be prepared by the following reaction scheme B wherein a compound of formula (VII) is treated with a compound of formula QCEN (IX) where Q is as stated above, in an inert solvent, in the presence of an inert gas as indicated in reaction scheme A and subjecting the reaction mixture to conventional hydrolysis, preferably with aqueous ammonium chloride. The reaction may be carried out at a temperature of from 5 to the reflux temperature of the solvent, preferably 50 C. to the solvent reflux temperature for about 1 to 8 hours, preferably about 6 hours. Neither the solvents nor the temperatures used are critical.

The compounds of formula (Ic) where R is lower alkyl or phenyl (Ic may also be prepared by the following reaction scheme C wherein a compound (Ia is treated in the same manner as compounds (Ia) in reaction scheme C.

The compounds of formula Id where R is lower alkyl or phenyl (Id may also be prepared by the following reaction scheme D wherein a compound of formula (Ia is treated in the same manner as compounds (Ia) in reaction scheme D.

The compounds of formula (Ia wherein Q is t-butyl, R and R are hydrogen, lower alkoxy as defined above or trifluoromethyl, (R and (Rf), R and R are hydrogen, lower alkyl as defined above, lower alkoxy as defined above, or halo as defined above, (R (R may be prepared by the following reaction scheme E.

wherein R R R and R are as defined above, R is as previously defined, and Y is halo having an atomic weight of 35 to 80.

The compounds of formula (Ie) may be prepared by treating a compound of formula (X) with t-butyl magnesium halide of formula (XI), in an inert solvent such as ether, tetrahydrofuran and the like in an inert atmos phere e.g. nitrogen, at a temperature of from about 25 C, to the reflux temperature of the solvent, preferably at the solvent reflux temperature, for about 3 to 24 hours, preferably about 16 to 20 hours. Neither the solvents nor the temperatures used are critical. Reaction scheme E is preferred for preparing compounds of formula (Ie wherein R and R are hydrogen and R and R are other have the above-stated significance, X is halo having an than hydrogen.

The compounds of formula (I) where R and R are hydrogen, R is methyl, Z is hydroxy, Q is tert-butyl and R or R is nitro (If) may be prepared by the following NCH, N02

ona HO HO 0 oh. CH3 on. om

The compounds of formula (If) may be prepared by treating 3-t-butyl 3 hydroxy 2 methylphthalimidine (Ia with alkali metal nitrate e.g. potassium nitrate in concentrated mineral acid e.g. sulfuric acid at a temperature of from about 20 to about 50 C. preferably from about 0 C. to 25 C. for about 24 hours. The temperatures used are not critical. Reaction scheme F is preferred for preparing the compounds of formula (If).

The compounds of formula (II) may be prepared by the following reaction scheme G wherein a compound of formula (Ia wherein R is methyl or phenyl (la is treated with a strong base such as sodium hydroxide or potassium hydroxide in aqueous monohydric alkanol or dihydric alkanol such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, ethylene glycol and the like at a temperature of from 50 C. to the reflux temperature of the solvent, preferably at the solvent reflux temperature, for about 12 to 72 hours, preferably 18 to 40 hours, and subsequently acidifying with concentrated mineral acid such as sulfuric acid, hydrochloric acid and the like.

The compounds of the formula (VII) may be prepared by the following reaction scheme H:

wherein R R R R R and the provisos have the above stated significance, and R is lower alkyl as defined above.

The compounds of formula (VII) are prepared by treating a compound of formula (XII) with an organo lithium compound of formula (XIII) in an inert solvent, in the presence of an inert gas as indicated in reaction scheme A The reaction may be carried out at a temperature of from about 70 to C.

The compounds of formulas (Ia), (Ib), (Ic), (Id), 1) l), 1) 1) 1) and may be recovered using conventional recovery techniques such as crystallization.

Certain of the compounds of formulas (X), (XI), (XII) and (XIII) are known and may be prepared according to methods disclosed in the literature. The compounds of formulas (X), (XI), (XII) and (XIII) not specifically disclosed are prepared according to analogous methods from known materials.

The compounds of formula (Ia) may be prepared in alkali metal salt form such as the sodium salt, potassium salt, lithium salt and the like by treating a compound of formula (Ia) with a base such as sodium hydroxide, potassium hydroxide or lithium hydroxide. When it is desired to convert such salts to the corresponding hydroxy compound, conventional techniques may be utilized.

The compounds of formulas (lb) or (Id) may be prepared in acid addition salt form, such as the hydrochloride, by conventional methods, such as suspending the compound of alcohol or water and treating with the appropriate acid. When it is desired to convert such salts to 6 the corresponding free bases, conventional techniques may be utilized, e.g., dissolution of the salt in water and precipitation using a base such as sodium hydroxide.

It will be understood that certain of the compounds of formula (I) can exist in racernic form or in the form of optically active isomers. The separation and recovery of the respective isomers may be readily accomplished employing conventional techniques and such isomers are included within the scope of the invention.

The compounds of formula (I) are useful because they possess pharmacological activity in animals. In particular, the compounds are useful as minor tranquilizers-sedative hypnotics, as indicated in the mouse given typically 25* 200 mg./kg. of body weight of the active compounds and tested using the 30-word adjective test basically as described by Irwin, S. (Gordon Research Conference, Medicinal Chemistry, 1959) and Chen (Symposium on Sedative and Hypnotic Drugs, Williams and Wilkins, 1954), the chemically induced seizures test basically as described by Orloif, et al., (Proc. Sol. Exp. Biol., 70: 254, 1949), the hexobarbital reinduction test, wherein immediately after the animals recover their righting reflex which was lost upon the administration of hexobarbital, reinduction is stated to occur if the animals once again lose their righting reflex, basically as described by Winter et al., J. Pharmacol. Exp. Therap. 94: 7-11, 1948, and the shock induced fighting mice test, basically as described by Tedeschi et al., J. Pharmacol. Exp. Therap. 28- 34, 1969.

For such usage, the compounds may be administered orally or parenterally as such or admixed with conventional pharmaceutical carriers.

The compounds of formula (Ia) may be administered in the form of their non-toxic alkali metal salts. Such salts possess the same order of activity as the free base. Representative of such salts are sodium, potassium or lithium salts, and the like.

The compounds of formulas (Ib) or (Id) may be similarly administered in the form of their non-toxic pharmaceutically acceptable acid addition salts. Such salts possess the same order of activity as the free base. Representative of such salts are the mineral acid salts, such as the hydrochloride, hydrobromide, sulfate, phosphate and the like and the organic acid salts, such as the succinate, benzoate, acetate, p-toluenesulfonate, benzenesulfonate, maleate, malate, tartrate, methanesulfonate, cyclohexylsulfamate and the like.

As noted above, the compounds of formula (I) exist as optical isomers. In some cases greater pharmacological activity or other beneficial attribute may be found for a particular isomer and in such instances administration of such isomer may be preferred.

The dosage of active ingredient employed for the tranquilizer-sedative hypnotic use may vary depending on the severity of the condition being treated. However, in general, satisfactory results are obtained when a compound of formula (I) is administered at a daily dosage of from about 1 milligram to about 300 milligrams per kilogram of animal body weight, preferably given in divided doses 2 to 4 times a day, or in sustained release form. For most larger mammals (e.g., primates) the total daily dosage is from about 60 to about 3000 milligrams. Dosage forms suitable for internal use comprise from about 15 to about 1500 milligrams of the active compound, in intimate admixture with a solid or liquid pharmaceutically acceptable carrier or diluent.

EXAMPLE 1 3-t-butyl-3-hydroxy-Z-methylphthalimidine To a flask equipped with a stirrer, dropping funnel, condenser and gas inlet tube maintained under a nitrogen atmosphere there was added at room temperature 15.2 g. (0.108 mole) of N-methylbenzamide in ml. dry tetrahydrofuran. The reaction flask was immersed in an ice bath and cooled to an internal temperature of 5 C.

Stirring was initiated and 152 ml. of 1.6M of n-butyllithium (0.240 mole) in hexane was added dropwise in ca. 1 hour maintaining the temperature below 8 C. The resulting red dilithio salt, (Compound VII) was stirred at 5 C. for 1 hour longer and then cooled to an internal temperature of 50 C. To the cold solution, a solution of 12.9 g. (0.108 mole) of trimethylacetylchloride (pivaloylchloride) in 75 m1. anhydrous tetrahydrofuran was added dropwise in ca. 45 minutes maintaining the temperature between 6 and 40 C. The resulting solution was stirred 2 hours at -50 C. and allowed to warm to C. and the resulting adduct treated with 100 ml. saturated aqueous ammonium chloride maintaining the temperature below 10 C. The layers were separated and the tetrahydrofuran dried over anhydrous magnesium sulfate, filtered and evaporated in vacuo. The resulting oil was triturated with cold ether and filtered to give 3-t-butyl-3- hydroxy-Z-methylphthalimidine rn.p. l66.8167 C.

EXAMPLE 2 Following the procedure of Example 1 and in place of N-methylbenzamide and starting with,

(a) N-methyl-4-methoxybenzamide,

(b) 4-chloro-N-methylbenzamide,

(c) 6-chloro-N-methylbenzamide,

(d) N-phenylbenzamide,

(e) 4-fiuoro-N-rnethylbenzamide,

(f) N-methyl-4-phenylbenzamide,

(g) 4-dimethylamino-N-methylbenzamide,

(h) S-methoxy-N-methylbenzamide,

(i) N,4-dimethylbenzamide,

(j) 4,S-dichloro-N-methylbenzamide,

(k) 4-t-butyl-N-methylbenzamide,

(l) 4-ethyl-N-methylbenzamide,

(m) 6-chloro-N-methylbenzamide,

(n) 3,4-dimethoxy-N-rnethylbenzamide,

(o) N-methyl-4-nitrobenzamide,

(p) N-methyl-4-aminobenzamide, or

(q) N-methyl-4,S-methylenedioxybenzamide,

the following products are obtained (a) 3-t-butyl-3-hydroxy-S-methoxy-Z-methylphthalimidine m.p. l65-166.-5 C.,

(b) 3-t-butyl-5-chloro-3-hydroxy-2-methylphthalimidine m.p. 192 C.,

(c) 3-t-butyl-7-chloro-3-hydroxy-2-methylphthalimidine m.p. 2025-2035 C.,

(d) 3-t-butyl-3-hydroxy-2-phenylphthalimidine m.p. 165-165.5 C.,

(e) 3-t-butyl-5-fiuoro-3-hydroxy-2-methylphthalimidine m.p. 165-167 C.,

(f) 3-t-butyl-3-hydroxy-2-methyl-S-phenylphthalimidine m.p. 202203 C.,

(g) 3-t-butyl-5-dimethylamino-3-hydroxy-2-methylphthalimidine rn.p. 178-183 C.,

(h) 3-t-butyl-3-hydroxy-6-methoxy-2-methylphthalimidine m.p. 140.5-141.5 C.,

(i) 3-t-butyl-2,5-dirnethyl-3-hydroxyphthalimidine m.p. 167169 C.,

(j) 3-t-butyl-5,6-dichloro-3-hydroxy-2-methylphthalimidine m.p. 1955-1965 C.,

(k) 3,5-bis(t-butyl)-3-hydroxy-2-methylphthalimidine m.p. 182.5183.5 C.,

(l) 3-t-butyl-5-ethyl-3-hydroxy-Z-methylphthalimidine mp. 136-137 c.,

(m) 3-t-butyl-5-chloro-2-ethyl-3-hydroxyphthalimidine m.p. 144-145 C.,

(n) 3-t-butyl-4,5-dimethoxy-3-hydroxy-2-methylphthalimidine m.p. 150151.5 C.,

(o) 3-t-butyl-3-hydroxy-2-methyl-5-nitrophthalimidine,

(p) -amino-3-t-butyl-3-hydroxy-2-methylphthalimidine,

or (q) 3-t-butyl-3-hydroxy-2-methyl-5,6-methylenedioxyphthalimidine, respectively.

8 EXAMPLE 3 Following the procedure of Example 1 and in place of N-methylbenzamide and starting with,

(a) N-methyl-6-meth0xybenzamide, (b) N-methyl-3,6-bis(trifiuoromethyl)benzamide, (c) N,3-dimethylbenzamide, or (d) N-methyl-3-methoxybenzamide,

the following products are obtained,

(a) 3-t-butyl-3-hydroxy-7-methoxy-2-methylphthalimidine,

(b) 3-t-butyl-3-hydroxy-2-methyl-4,7-bis trifiuoromethyl) phthalimidine,

(c) 3-t-butyl-2,4-dimethyl-3-hydroxyphthalimidine, or

(d) 3-t-butyl-3-hydroXy-4-methoxy-Z-methylphthalimidine, respectively.

EXAMPLE 4 Following the procedure of Example 1 and in place of trimethylacetylchloride, and starting with,

(a) 2,2-pentamethylenepropanoyl chloride, or

(b) 2,2-hexamethylenepropanoyl chloride,

the following products are obtained,

(a) 3-(1-[1,l-cyclopentamethylene]ethyl) 3 hydroxy- 2-methylphthalimidine, m.p. 1455-1465 C.,

(d) 3-(1-[1,1-cyclohexamethylene]ethyl) 3 hydroxy-2- methylphthalimidine, mp. 145.8146.5 C., respectively.

Following the procedure of Example 1 and in place of N-rnethylbenzamide and starting with 4-chloro-N-methylbenzamide, and in place of trimethylacetylchloride, and starting with,

(b) 2,2-dimethyl-4-pentoyl chloride, or (c) methacryloylchloride,

the following products are obtained,

(b) 3-(1,1-dimethyl-3-butenyl) 5 chloro-3-hydroxy-2- methylphthalimidine m.p. l38140 C.,

(c) 3-hydroxy-3-isopropenyl 5 chloro-2-methylphthalimidine mp. 175-177 C., respectively.

EXAMPLE 5 Following the procedure of Example 1 and in place of trimethylacetylchloride and starting with,

(a) Z-methylbutanoyl chloride, (b) 2,2-tetramethylenepropanoyl chloride, or (c) 2,2,3-trimethyl-3-butanoy1 chloride,

the following products are obtained,

(a) 3-(1-ethyl-2-methylpropyl) 3 hydroxy-Z-methylphthalimidine,

(b) 3-hydroxy-2-methyl-3-(1 methylcyclopentyl)phthalimidine, or

(c) 3 hydroxy 2 methyl-3-( 1,1,Z-trimethylallyl)phthalimidine, respectively.

EXAMPLE 6 3-t-butyl-5-chloro-3-hydroxy-2-methylphthalimidine To a flask equipped with a stirrer, dropping funnel, condenser and gas inlet tube maintained under a nitrogen atmosphere there was added at room temperature 15.2 g. (0.087 mole) of 4-chloro-N-methylbenzamide in ml. dry tetrahydrofuran. The reaction flask was immersed in Dry Ice-isopropanol bath and cooled to an internal temperature of 60 C. Stirring was initiated and 152 ml. of 1.6M of n-butyllithium (0.240 mole) in hexane was added dropwise in ca. 1 hour maintaining the temperature below 60 C. The resulting red dilithio salt (compound VII) was stirred at 60 C. for 1 hour longer. To the cold solution, a solution of 12.9 g.

(0.087 mole) of trimethylacetylchloride (pivaloyl chloride) in 75 ml. anhydrous tetrahydrofuran was added dropwise in ca. 45 minutes maintaining the temperature between --60 and 40" C. The resulting solution was stirred 2 hours at 50 C. and allowed to warm to C. and the resulting adduct treated with 100 ml. saturated aqueous ammonium chloride maintaining the temperature below C. The layers were separated and the tetrahydrofuran dried over anhydrous magnesium sul fate, filtered and evaporated in vacuo. The resulting oil was triturated with cold ether and filtered to give 3-tbutyl-S-chloro-S-hydroxy 2 methylphthalimidine m.p. 192 C.

EXAMPLE 7 3t-butyl-S-chloro-3hydroxy-Z-ethylphthalimidine Step A 3t-butyl-S-chloro-3hydroxy-2-phenylphthalimidine To a flask equipped with a stirrer, dropping funnel, condenser and gas inlet tube maintained under a nitrogen atmosphere there was added 50 g. (0.216 mole) of 4- chlorobenzanilide and 1.0 liter tetrahydrofuran. The mixture was cooled to -60 C. and 318 ml. (0.475 mole) of n-butyllithium in hexane) was added dropwise keeping temperature between -50 to 60 C. After the addition was complete the mixture was stirred at 60 C. for 2 hours and then 25.99 (0.216 mole) of pivaloyl chloride in 200 ml. tetrahydrofuran was added dropwise maintaining the temperature between -50" to 60 C. The mixture was stirred 2 hours at 60 C., warmed to C. and treated with 200 ml. of saturated ammonium chloride solution. The mixture was filtered, the layers separated and the organic layer dried over anhyd. magnesium sulfate, filtered and evaporated. The resulting white solid was triturated with ether to give 3 butyl-5-chloro-3hydroxy-2-phenylphthalimidine, rn.p. 1985-2005 C.

Step B 3t-butyl-S-chloro-3hydroxyphthalide A mixture of 42 g. (0.136 mole) of 3-t-butyl-5-chloro- 3hydroxy-Z-phenylphthalimidine, 50 g. (0.720 mole) of potassium hydroxide, 300 ml. of ethylene glycol and 150 ml. water was refluxed for 24 hours. The solvents were removed in vacuo and water added to the residue and filtered. The filtrate was acidified with cone. hydrochloric acid and the white slurry filtered and recrystallized from isopropanol-water (1:1) to give 3-t-butyl-5-chloro-3-hydroxyphthalide, mp. 160-161 C.

Step C 3-t-butyl-5-ch1oro-3hydroxy-2-ethylphthalimidine A mixture of 4.09 (0.016 mole) of 3-t-butyl-5-chloro-3- hydroxyphthalide, 3 ml. (0.04 mole) of thionyl chloride and 100 ml. of benzene was refluxed for 2 hours. The solvent was removed in vacuo in the residue dissolved in 50 ml. of ether and added to g. of a 70% solution of ethylamine in water (0.26 mole). The resulting mixture was stirred 18 hours at room temperature and the solvents were removed in vacuo. The resulting yellow solid 'was purified by trituration with water to give 3-t-butyl-5- chloro-3-hydroxy-2-ethylphthalimidine, mp. 144-145 C.

EXAMPLE 8 Following the procedure of Example 7, Step B and in place of 3-t-butyl-5-chloro-3hydroxy-Z-phenylphthalimidine and starting with the correspondingly lettered product of Example 2, the following compounds of formula (II) are prepared,

10 (a) 3-t-butyl-3hydroxy-S-methoxyphthalide, (b) 3t-butyl-5-chloro-3-hydroxyphthalide, (c) 3-t-butyl-7-chloro-3hydroxyphthalide, (d) 3t-butyl-3-hydroxyphthalide, (e) 3-t-butyl-5-fiuoro-3hydroxyphthalide, (f) 3t-butyl-3hydroxy-S-phenylphthalide, (g) 3-t-butyl-5-dimethylamino-3hydroxyphthalide, (h) 3-t-butyl-3hydroxy-6-methoxyphthalide, (i) 3-t-butyl-2,S-dimethyl-3-hydroxyphthalide, (j) 3-t-butyl-5 ,6-dichloro-3-hydroxyphtha1ide, (k) 3,5-bis(t-butyl)-3-hydroxyphthalide, (l) 3-t-butyl-5-ethyl-3hydroxyphthalide, (m) 3t-butyl-S-chloro-3-hydroxyphthalide, (n) 3-t-butyl-4,5-dimethoXy-3hydroxyphthalide, (o) 3-t-butyl-3-hydroxy-5 or o-nitrophthalide, (p) 5 or 6-amino-3t-butyl-3-hydroxyphthalide, or (q) 3t-butyl-3hydroxy-S,6methylenedioxyphthalide, re-

spectively.

EXAMPLE 9 Following the procedure of Example 7, Step B and in place of 3t-butyl-5-chloro-3hydroxy-Z-phenylphthalimidine, and starting with the correspondingly lettered product of Example 3, the following compounds of formula (II) are obtained,

(a) 3t-butyl-3hydroxy-7-methoxyphthalide, (b) 3-t-butyl-3-hydroxy-4,7-bis(trifiuoromethyl) phthalide, (c) 3t-butyl-3hydroxy-4-methylphthalide, or (d) 3t-butyl-3hydroxy-4-methoxyphthalide, respectively.

EXAMPLE 10 Following the procedure of Example 7, Step B and in place of 3t-butyl-S-chloro-3hydroxy-2phenylphthalimidine, and starting with the correspondingly lettered prodnot of Example 4, the following compounds of formula (II) are obtained,

(a) 3-( 1- 1, l-cyclopentamethylene] ethyl) 3-hydroxyphthalide,

(b) 3- 1,1-dimethyl-3-butenyl)5-chloro-3-hydroxyphthalide,

(c) 3-hydroxy-3isopropenyl-S-chlorophthalide, or

(d) 3- l- 1,1-cyclohexamethylene] ethyl) 3-hydroxyphthalide, respectively.

EXAMPLE 11 Following the procedure of Example 7, Step B and in. place of 3 t butyl 5 chloro 3 hydroxy 2 phenylphthalimidine, and starting with the correspondingly lettered product of Example 5, the following compounds of formula (II) are obtained,

(a) 3-(1-ethyl-2-methylpropyl)3-hydroxyphthalide, (b) 3-hydroxy-3-(l-methylcyclopentyl)phthalide, or (e) 3-hydroxy-3-(1,1,2-trimethylallyl)phthalide, respectively.

EXAMPLE 12 3amino-3t-butyl-Z-methylphthalimidine A solution of 8 g. (0.0036 mole) of 3 t butyl 3- hydroxy 2 methylphthalimidine, 40 ml. thionyl chlo ride and 75 ml. benzene was refluxed for 2 hours. The solvents were removed in vacuo and the resulting oil dissolved in 15 ml. of benzene and added to a solution of benzene saturated with ammonia and the mixture stirred at room temperature for 18 hours. The solvents were removed in vacuo and the residue dissolved in methylene chloride, washed with ml. 2N sodium hydroxide, dried over anhyd. magnesium sulfate and evaporated in vacuo. The resulting solid was filtered, washed with water and dried to give 3 amino 3 t butyl 2 methylphthalimidine, m.p. -1955 C.

1 1 EXAMPLE 13 Following the procedure of Example 12 and in place of 3 t butyl 3 hydroxy 2 methylphthalimidine, and starting with the correspondingly lettered product of Example 2, the following compounds of formula (Ib) are prepared,

(a) 3-amino-3-t-butyl-5-methoxy-Z-methylphthalimidine,

(b) 3-amino-3-t-butyl-5-chloro-2-methylphthalimidine,

(c) 3-amino-3-t-butyl-7-chloro-2-methylphthalimidine,

(d) 3-amino-3-t-butyl-Z-phenylphthalimidine,

(e) 3-amino-3-t-butyl-S-fiuro-2-methylphthalimidine,

(f) 3-amino-3-t-butyl-2-methyl-S-phenylphthalimidine- 2-methyl,

(g) 3-amino-3-t-butyl-S-dimethylamino-2- methylphthalimidine,

(h) 3-amino-3-t-butyl-6-methoxy-2-methylphthalimidine,

(i) 3-amino-3-t-butyl-2,S-dimethyl-Z-methylphthalimidine,

(j) 3-amino-3-t-butyl-S,6-dichloro-2-methylphthalimidine,

(k) 3-arnino-3,5-bis(t-butyl)-2-methylphthalimidine,

(l) 3-amino-3-t-butyl-5-ethyl-2-methylphthalimidine,

(m) 3-amino-3-t-butyl-S-chloro-2-ethylphthalimidine,

(n) 3-amino-3-t-butyl-4,S-dimethoxy-Z- methylphthalimidine,

(o) 3-amino-3-t-butyl-2-methyl-5 or 6-nitrophthalimidine,

(p) 3,5 or 6-amino-3-t-butyl-2-methylphthalimidine, or

(q) 3-amino-3-t-butyl-2-methyl-5,6-methylenedioxyphthalimidine, respectively.

EXAMPLE 14 Following the procedure of Example 12 and in place of 3-t-butyl-3-hydroxy-2-methylphthalimidine, and starting with the correspondingly lettered product of Example 3, the following compounds of formula (Ib) are prepared,

(a) 3-amino-3-t-butyl-7-methoxy-2-methylphthalimidine, (b) 3-amino-3-t-butyl-2-methyl-4,7-bis(trifluoromethyl) phthalimidine, (c) 3-amino-3-t-butyl-2,4-dimethylphthalimidine, or (d) 3-amino-3-t-butyl-4-methoxy-2-methylphthalimidine,

respectively.

EXAMPLE 15 Following the procedure of Example 12 and in place of 3-t-butyl-3-hydroxy-2-methylphthalimidine, and starting with the correspondingly lettered product of Example 4 the following compounds of formula (Ib) are prepared,

(a) 3-amino-3-(1[1,1-cyclopentamethylene]ethyl)-2- methylphthalimidine,

(b) 3-arnino-3- l, l-dimethyl-3 -butenyl) -5-chloro-2 methylphthalimidine,

(c) 3-amino-3-isopropenyl-5-chloro-2-methylphthalimidine, or

(d) 3-amino-3-( 1- 1, l-cyclohexamethylene] ethyl) -3- hydroxy-2-metl1ylphthalimidine, respestively.

EXAMPLE 16 Following the procedure of Example 12 and in place of 3 t butyl 3 hydroxy 2 methylphthalimidine, and starting with the correspondingly lettered product of Example 5, the following compounds of formula (Ib) are prepared,

(a) 3-amino-3- l-ethyl-Z-methylpropyl)-2- methylphthalimidine,

(b) 3-amino-2-methyl-3- 1-methy1cyclopentyl)- phthalimidine, or

(c) 3-amino-2-methyl-3 l, l ,2-trimetl1y1allyl)- phthalimidine, respectively.

EXAMPLE l7 3-t-butyl-3 -methoxy-2-methylphthalimidine A solution of 8 g. (0.0036 mole) of 3 t butyl 3- hydroxy 2 methylphthalimidine, ml. of thionyl chloride and m1. of benzene was refluxed for 2 hrs. 75

The solvent was removed in vacuo and the resulting oil was dissolved in ml. methanol and allowed to stand at room temperature for 18 hours. The solvent was removed in vacuo to give 3 t butyl 3 methoxy 2- methylphthalimidine as an oil, identified by CHN analysis, N.M.R. and IR.

EXAMPLE 18 Following the procedure of Example 17 and in place of 3 t butyl 3 hydroxy 2 methylphthalimidine, and starting with the correspondingly lettered product of Example 2, the following compounds of formula (Ic) are prepared,

EXAMPLE 19 Following the procedure of Example 17 and in place of 3 t butyl 3 hydroxy 2 methylphthalimidine, and starting with the correspondingly lettered product of Example 3, the following compounds of formula (Ic) are prepared,

(a) 3-t-butyl-3,7-dimethoxy-2-methylphthalimidine, (b) 3-t=butyl-3-methoxy-2-methyl-4,7-bis trifiu oromethyl phthalimidine, (c) 3-t-butyl-2,4-dimethyl-3-methoxyphthalimidine, or (d) 3-t-butyl-3,4-dimethoxy-2-methylphthalimidine,

respectively.

EXAMPLE 20 Following the procedure of Example 17 and in place of 3 t butyl 3 hydroxy 2 methylphthalimidine, and starting with the correspondingly lettered product of Example 4, the following compounds of formula (Ic) are prepared,

(a) 3-(1-[1,1-cyclopentamethylene]ethyl)-3-methoxy- 2-methylphthalimidine,

(b) 3- l ,1-dimethyl-3-butenyl)-5-chloro-3-meth0xy- 2-methylphthalimidine,

(c) 3-methoxyl2-methyl-3- 1,1,2-trimethylally) phthalimidine, or

(d) 3-( l-[1,1-cyclohexamethylene] ethyl-3-meth0xy- Z-methylphthalimidine, respectively.

EXAMPLE 21 Following the procedure of Example 17 and in place of 3 t butyl 3 hydroxy 2 methylphthalimidine, and starting with the correspondingly lettered product of Example 5, the following compounds of formula (Ic) are prepared,

13 (a) 3-(1-ethyl-2-methylpropyl)-3-methoxy-2- methylphthalimidine, (b) 3-methoxy-2-methyl-3- 1-methylcyclopentyl)- phthalimidine, or (c) 3-methoxy-2-methyl-3-( 1,1,2-trimethylallyl) phthalimidine, respectively.

EXAMPLE 22 3-t-butyl-3-(2- [dimethylamino] ethylamino)-2- methylphthalimidine A solution of 8 g. (0.0036 mole) of 3 t butyl 3- hydroxy 2 methylphthalimidine, 40 ml. thionyl chloride and 75 ml. benzene was refluxed for 2 hours. The solvents were removed in vacuo and the resulting oil dissolved in 15 ml. benzene and added to a solution of 11.5 ml. (0.102 mole) of unsymmetrical dimethylethylenediamine in 50 ml. benzene and the mixture stirred at room temperature for 18 hours. The solvents were removed in vacuo and the residue dissolved in methylenechloride, washed with 100 ml. 2N sodium hydroxide, dried over anhyd. magnesium sulfate and evaporated in vacuo. The resulting oil was dissolved in isopropanol, treated with gaseous hydrogen chloride and the solid recrystallized from acetonitrile to give 3 t butyl 3 (2 [dimethylamino]ethylamino) 2 methylphthalimidine dihydrochloride, m.p. 142143.5 C.

EXAMPLE 23 Following the procedure of Example 22 and in place of 3-t-butyl-3-l1ydroxy-2-methylphthalimidine and starting with the correspondingly lettered product of Example 2, the following compounds of formula (Id) are prepared as the dihydrochloride (a) 3 -t-butyl-3- 2- [dimethylamino ethylamino methoXy-Z-methylphthalimidine,

(b) 3-t-butyl-5-chloro-3-(2-[dimethylamino]ethylamino)- 2-methylphthalimidine (c) 3-t-butyl-7-chloro-3- 2- [dimethylamino 1 ethylamino 2-methylphthalimidine,

(d) 3-t-butyl-3- (2- [dimethylamino] ethylamino -2- phenylphthalimidine,

(e) 3-t-butyl-3- (2- [dimethylamino] ethylamino -2- methylphthalimidine,

(f) 3-t-butyl-3- 2- [dimethylamino] ethylamino -2- methyl-5-phenylphthalimidine,

(g) 3-t-butyl-5-dimethylamino-3-(Z-[dimethylamino] ethylamino -2-methylphthalimidine,

(h) 3-t-butyl-3- (2- [dimethylamino] ethylamino -6- methoxy-2-methylphthalimidine,

(i) 3-t-butyl-3,5-dimethyl-3- 2- [dimethylamino] ethylamino -2-methylphthalimidine,

(j) 3-t-butyl-5 ,6-dichloro-3- 2- [dimethylamino] ethylamino)-2-methylphthalimidine,

(k) 3,5 -bis (t-butyl -3- (2- [dimethylamino] ethylamino 2-methylphthalimidine,

(l) 3-t-butyl-3- 2- [dimethylamino] ethylamino -3 ethyl-Z-methylphthalimidine,

(m) 3 -t-butyl-5-chloro-2-ethyl-3- 2- [dimethylamino] ethylamino phthalimidine,

(n) 3-t-butyl-4 ,5-dimethoxy-3-(Z-[dimethylamino] ethylamino -2-methylphthalimidine,

(o) 3-t-butyl-3- 2- [dimethylamino] ethylamino) -2- methyl-5 or 6-nitrophthalimidine,

(p) 5 or 6-amino-3-butyl-3-(2-[dimethylamino] ethylamino)-2-methylphthalimidine, or

(q) 3-t-butyl-3- (2- [dimethylamino]ethylamino -2- methyl-5,6-methylenedioxyphthalimidine, respectively EXAMPLE 24 Following the procedure of Example 22 and in place of 3-t-butyl-3-hydroxy-2-methylphthalimidine and starting with the correspondingly lettered product of Example 3, the following compounds of formula (Id) are prepared,

(a) 3-t-butyl-3-(2-[dimethylamino]ethylamino)-7- methoxy-Z-methylphthalimidine,

(b) 3-t-butyl-3 (2- [dimethylamino 1 ethylamino -2- methyl-4,7-bis(trifiuoromethyl)phthalimidine,

(c) 3-t-butyl-2,4-dimethyl3- 2- [dimethylamino] ethylamino phthalimidine, or

(d) 3-t-butyl-3- 2- [dimethylamino] ethylamino) -4- methoxy-2-methylphthalimidine, respectively.

EXAMPLE 25 Following the procedure of Example 22 and in place of 3-t-butyl-3-hydroxy-2-methylphthalimidine, and starting with the appropriately lettered product of Example 4, the following compounds of formula (Id) are prepared,

(a) 3- 1- 1 l-cyclopentamethylene] ethyl) -3 2- [dimethylamino] ethylamino -2-methylphthalimidine,

(b) 3- 1, 1-dimethyl-3-butenyl -5-chloro-3- (2- [dimethylamino ethylamino -2-methylphthalimidine,

(c) 3-( 2- [dimethylamino ethylamino5-chloro-3- isopropenyl-Z-methyl-phthalimidine, or

(d) 3-(1-[1,1-cyclohexamethylene]ethyl)3-(2-[dimethylamino] ethyl) -2-methylphthalimidine, respectively.

EXAMPLE 26 Following the procedure of Example 22 and in place of 3-t-butyl-3-hydroxy-Z-methylphthalimidine, and starting with the correspondingly lettered product of Example 5, the following compounds of formula (Id) are prepared,

(a) 3- l-ethyl-2-methylpropyl-)-3- (2- [dimethylamino] ethylamino) -2-methyl phthalimidine,

(b) 3-(2- [dimethylamino]ethylamino) -2-methyl-3- (l-methylcyclopentyl) phthalimidine, or

(c) 3- 2- [dimethylamino ethylamino -2-methyl-3- (1,2-trimethylallyl) phthalimidine, respectively.

EXAMPLE 27 3-t-buty1-5,6-dichloro-3-hydroxy-2-methylphthalimidine To a suspension of 1.8 g. (0.065 g.-atoms) of magnesium turnings in 50 ml. dry tetrahydrofuran under nitrogen was added dropwise 6.3 g. (0.065 mole) of Z-chloro- Z-methyl propane in ml. dry tetrahydrofuran and the reaction catalyzed with a drop of ethyl bromide. After the addition was complete the mixture was refluxed for 2 hours cooled to room temperature and then 10 g. (0.0435 mole) of 4,5-dichloro-Z-methylphthalimide in 200 ml. tetrahydrofuran was added dropwise and the resulting mixture refluxed for 18 hours. The mixture was cooled in ice and treated with 100 ml. Water, filtered and the layers separated. The organic layers was dried over anhyd. magnesium sulfate, filtered and evaporated and the residue recrystallized from isopropanol-water (1:1) to give 3-tbutyl-5,6-dichloro-3-hydroxy 2 methylphthalimidine hydrate, m.p. 195.5196.5 C.

EXAMPLE 28 3-t-butyl-3-hydroxy-2-methyl-5 or 6-nitrophthalimidine A solution of 20 g. (0.09 mole) 3-t-butyl-3-hydroxy-2- methyl-phthalimidine in 80 ml. conc. sulfuric acid was cooled to 0 C. and a solution of 13.0 g. (0.129 mole) of potassium nitrate in 80 ml. conc. sulfuric acid was added dropwise with stirring keeping the temperature at 0 C. Stirring was continued at 0 C. for 1 hour after addition and then at room temperature for 24 hours. The solution was poured on to 1200 g. ice and extracted twice with 250 ml. chloroform. The chloroform extract was washed four times with ml., 10% sodium bicarbonate and twice with ml. water, dried over anhyd. magnesium sulfate, filtered and evaporated. The resulting solid was recrystallized from isopropanol-water 1:1) to give 3-t-butyl-3-hydroxy-2-methyl-5 or 6-nitrophthalimidine, m.p. 210212 C.

15 EXAMPLE 29 3-amino-3 -t-butyl-2-methylphthalimidine To a flask equipped with a stirrer, dropping funnel, condenser and gas inlet tube maintained under a nitrogen atmosphere there was added at room temperature 15.2 g. (0.108 mole) of N-methylbenzamide in 150 ml. dry tetrahydrofuran. The reaction flask was immersed in an ice bath and cooled to an internal temperature of 5 C. Stirring was initiated and 152 ml. of 1.6M of n-butyllithium (0.240 mole) in hexane was added dropwise in ca. 1 hour maintaining the temperature below 8 C. The resulting red dilithio salt (Compound VII) was stirred at 5 C. for 1 hour longer and then 8.95 g. (0.108 mole) of trimethylacetonitrile (pivaloyl nitrile) in 75 ml. tetrahydrofuran was added dropwise to the cold solution. At the completion of the addition, the mixture was refluxed for 4 /2 hours, cooled in ice and treated with 100 ml. saturated ammonium chloride solution maintaining the temperature below 10 C. The resulting solid was filtered, washed with water and dried to give 3-amin0-3-t-butyl-2-methylphthalimidine, m.p. 195-1955 C.

EXAMPLE 30 Following the procedure of Example 7, Step C and in place of 3-t-butyl-5-chloro-3-hydroxyphthalide starting with 3-tbutyl-3-hydroxy-2-phenylphthalide, and in place of ethylamine and starting with,

(a) allylamine,

(b) benzylamine,

(c) N-methylcarbamoyloxyamine, (d) carbethoxymethylamine, or (e) ethanolamine,

the following products of formula (Ia) are obtained 5 EXAMPLE 31 Following the procedure of Example 12 and in place of 3-t-butyl-3-hydroxy-Z-methylphthalimidine, and starting with the correspondingly lettered product of Example 30, the following compounds of formula (1b) are prepared,

(a) 2-allyl-3-amino-3-t-butylphthalimidine,

(b) 3-amino-2-benzyl-3-t-butylphthalimidine,

(c) 3-a1nino3-t-butyl-2-N-methylcarbamoyloxyphthalimidine,

(d) 3-amino-3-t-butyl-2-carbethoxymethylphthalimidine, or

(e) 3-amino-3-t-butyl-2-(Z-hydroxyethyl)phthalimidine,

respectively.

EXAMPLE 32 Following the procedure of Example 17 and in place of 3-t-butyl-3-hydroxy-Z-methylphthalimidine, and starting with the correspondingly lettered product of Example 30, the following compounds of formula (Ic) are prepared,

(a) 2-allyl-3-t-butyl-3-methoxyphthalimidine,

(b) 2-benzyl-3-t-butyl-3-methoxyphthalimidine,

(c) 3-t-butyl-3-rnethoxy-2-N-methylcarbamoyloxyphthalimidine,

(d) 3-t-butyl-2-carbethoxymethyl-3-methoxyphthalimidine, or

(e) 3-t-butyl-2-(2-hydroxyethyl)-3-methoxyphthalimidine, respectively.

16 EXAMPLE 33 Following the procedure of Example 22 and in place of 3-t-butyl-3-hydroxy-2-methylphthalimidine, and starting with the correspondingly lettered product of Example 30, the following compounds of formula (Id) are prepared,

(a) 2-allyl-3-t-butyl-3- (2- [dimethylamino] ethylamino) phthalimidine,

(b) 2-benzyl-3-t-butyl-3- (2- [dimethylamino] ethylamino) phthalimidine,

(c) 3-t-butyl-3- (2- [dimethylamino] ethylamino -2-N- methylcarbamoyloxyphthalimidine,

(d) 3-t-butyl-2-carbethoxymethyl-3-(Z-[dimethylamino] ethylamino)phthalimidine, or

(e) 3-t-butyl-3-(2-[dimethylamino]ethylamino)-2-(2-hydroxyethyl)phthalimidine, respectively.

EXAMPLE 34 Following the procedure of Example 27 and in place of 4,5-dichloro-2-methylphthalimidine and starting with,

(a) 2-phenylphthalimide,

(b) 4,7-dimethoxy-Z-methylphthalimide,

(c) 4,7-bis(trifluoromethyl)-2-methylphthalimide, (d) 2,5,6-trimethylphthalimide,

(e) 5,6-dimethoxy-Z-methylphthalimide,

the following products are obtained,

(a) 3-t-butyl-3-hydroxy-2-phenylphthalimidine,

(b) 3-t-butyl-4,7-dimethoxy-3-hydroxy-2-methylphthalimidine,

(c) 3-t-butyl-3-hydroxy-2-methyl-4,7-bis(trifluoromethyl) phthalimidine,

(d) 3-t-butyl-3-hydroxy-2,5,6-trimethylphthalimidine,

(e) 3-t-butyl-5,6-dimethoxy-3-hydroxy-2-methylphthalimidine, respectively.

EXAMPLE 35 Following the procedure of Example 29 and in place of N-methylbenzamide and starting with the correspondingly lettered starting materials of Example 2, the correspondingly lettered compounds of formula (lb) of Example 13 are obtained.

EXAMPLE 36 Following the procedure of Example 29 and in place of N-methylbenzamide and starting with the correspondingly lettered starting materials of Example 3, the correspondingly lettered compounds of formula (1b) of Example 14 are obtained.

EXAMPLE 37 Following the procedure of Example 29 and in place of trimethylacetonitrile, and starting with,

(a) 2,2pentamethylenepropionitrile, or (d) 2,2-hexamethylenepropionitrile,

the following products are obtained,

(a) 3-amino-3- 1-[ 1, l-cyclopentamethylene] ethyl) -2- methylphthalimidine, or

(d) 3-amino-3- 1-[ 1,1-cyclohexamethylene]ethy1-3-hydr0xy-2-methylphthalimidine, respectively.

Following the procedure of Example 29 and in place of N-methylbenzamide and starting with 4-chloro-N- methylbenzamide, and in place of trimethylacetonitrile, and starting with,

(b) 2,2-diemthyl-4-pentenonitrile, or (c) methacrylonitrile,

the following products are obtained,

(b) 3-amino-3-( 1, 1-dimethyl-3-butenyl)-5-chloro-2- methylphthalimidine, or

(c) 3-amino-3-isopropenyl-5-chloro-2-methylphthalimidine, respectively.

1 7 EXAMPLE 38 Following the procedure of Example 29, and in place of trimethylacetonitrile, and starting with,

(a) 2-methylbutanonitrile, (b) 2,2-tetramethylenepropanionitrile, or (c) 2,2,3-trimethyl-3-butanonitrile,

The correspondingly lettered compounds of formula (1b) of Example 16 are obtained.

EXAMPLE 39 Following the procedure of Example 7, step C, and in place of ethylamine and starting with (a) propylamine or (b) allylamine,

the following products of formula (Ia) are obtained,

(a) 3-t-butyl-5-chloro-3-hydroxy-2-propylphthalimidine,

m.p. 129-131 C., or

(b) 2-allyl-3-t-butyl-5-chloro-3-hydroxyphthalimidine,

m.-p. 125-126.5 C., respectively.

EXAMPLE 40 Following the procedure of Example 7, step C and in place of 3-t-butyl-5-chloro-3-hydroxyphthalide and starting with (a) 3-t-butyl-3-hydroxy-S-methoxyphthalide, or (b) 3-t-butyl-3-hydroxy-5-methylphthalide the following products of formula (Ia) are obtained,

(a) 3-t-butyl-2-ethyl-3-hydroxy-5-methoxyphthalimidine m.p. 180-182 C. or (b) 3-t-butyl-2-ethyl-3-hydroxy S-methylphthalimidine mp. 143-144 C., respectively.

EXAMPLE 41 I Tablets and capsules containing the ingredients indicated below may be prepared by conventional techniques and are useful as minor tranquilizers-sedative hypnotics at a dose of one tablet or capsule 2 to 4 times a day.

Weight (mg.)

Ingredients Tablet Capsule 3-t-butyl-5-chloro-3-hydroxy-2-rnethyl-phthal- EXAMPLES 44 AND 45 Sterile Suspension for Injection and Oral Liquid Suspension The folowing pharmaceutical compositions are formulated with the indicated amount of active agent using conventional techniques The injectable suspension and the oral liquid suspension represent formulations useful as unit doses and may be administered as minor tranquilizers- 18 i sedative hypnotics. The injectable suspension is suitable for administration once a day whereas the oral liquid suspension is suitably administered 2 to 4 times per day for this purpose.

Weight (mg.)

Sterile Oral injectable liquid suspensuspen- Ingredrents sion sion 3-t-butyl-5-ch10r0-3-hydr0xy-2-rnethy1-phthal- I imidine 25 25 Sodium carboxy methyl cellulose U.S.P 1. 25 12. 5 Methyl cellulose 0. 4 Polyvinylpyrrolid 5 Lecithin 3 Benzyl alcohol 0. 01 Magnesium aluminum silicate- 47. 5 Flavor c c q.s. Color r c q.s. Methyl paraben, U.S. 4.5 Prooyl paraben, U.S.P 1.0 Polyso 'bate (e.g., Twee 0), 5 Sorbitol solution. 70% U.S.P 2, 500 Butler agent to adjust pH for desired stability. q.s. q.s. Water 1 For i 'ljeetion, q.s. to 1 m1. 1 Q s. to 5 ml.

EXAMPLES 46 AND 47 Following the procedures of Examples 42 and 43, in place of 3-t-butyl-5-chloro-3-hydroxy-2-methylphthalimidine starting with,

(a) 3-t-butyl-3-hydroxy-2-methylphthalimidine,

(b) 3-t-butyl-3-hydroxy-S-methoxy-Z-methylphthalimidine,

(c) 3-t-butyl-2,5-dimethyl-3-hydroxy-2-methylphthalimidine, or

(d) 3-t-butyl-2-ethyl-3-hydroxy-S-methylphthalimidine,

tablets and capsules may be prepared which are useful as minor tranquilizers-sedative hypnotics at a dose of on tablet or capsule 2 to 4 times a day. 3

EXAMPLES 48 AND 49 injectable suspensions and oral liquid suspensions may be prepared which are useful as minor transquilizers-sedative hypnotics at a dose of one tablet or capsule 2 to 4 times a day.

What is claimed is:

1. A compound of the formula,

I II R I ia Z Q I where R, is hydrogen, lower alkoxy, halo having an atomic weight of 19 to 36, or trifiuoromethyl, p L

R is hydrogen, lower alkyl, lower alkoxy, halo having an atomic weight of 19 to 36, trifluoromethyl, nitro or amino,

R is hydrogen, lower alkyl, lower alkoxy, halo having an atomic weight of 19 to 36, trifiuoromethyl, nitro, amino, dialkylamino or phenyl,

R is hydrogen, lower alkyl, lower alkoxy, or trifiuoromethyl,

19 R is hydrogen, lower alkyl, phenyl, allyl, benzyl, hy-

droxyethyl, carbamoyloxy, or carbethoxymethyl, or R and R and R or R and R together are methylenedioxy, Q is where R and R are each independently methyl or ethyl, or

R and R together are (CH where n is 4, 5,

or 6, R is methyl, vinyl or allyl, or

where R is lower alkyl,

Z is hydroxy, amino, lower alkoxy,

R10 or NHCH2CH1N n where R and R are independently lower alkyl, provided that (1) no more than two of R R R or R are other than hydrogen, (2) when either of R of R is halo, the other of R or R is not halo, (3) only one of R and R or R and R is alkoxy at one time, (4) there are no two trifluoromethyl groups on adjacent carbon atoms, (5 only on of R or R is nitro or amino, (6) when Z is hydroxy and Q is t-butyl, then R R R R and R are not hydrogen. 2. The compound of claim 1 which is 3-t-butyl-3-hydroxy-2-methylphthalimidine.

3. The compound of claim 1 which is 3-t-buty1-3-hydroxy-S-methoxy-Z-methylphthalimidine.

4. The compound of claim 1 which is 3 t butyl 5- chloro-3-hydroxy-2-methylphthalimidine.

5. The compound of claim 1 which is 3-t-butyl-7-chloro- 3-hydroxy-2-methylphthalimidine.

6. The compound of claim 1 which is 3-t-butyl-3-hydroxy-Z-phenylphthalimidine.

7. The compound of claim 1 which is 3-t-butyl-5-fluoro- 3-hydroxy-2-methylphthalimidine.

8. The compound of claim 1 which is 3-t-butyl-3-hydroxy-2-methyl-5-phenylphthalimidine.

9. The compound of claim 1 which is 3-t-butyl-5-dimethylamino-3-hydroxy-2-methylphthalimidine.

' 10. The compound of claim 1 which is 3-t-butyl-3-hydroxy-6-methoxy-2-methylphthalimidine.

11. The compound of claim 1 which is 3-t-butyl-2,5-dimethyl-3-hydroxyphthalimidine.

12. The compound of claim 1 which is 3-t-butyl-5,6-dichloro-3-hydroxy-2-methylphthalimidine.

13. The compound of claim 1 which is 3,5-bis(t-butyl)- 3-hydroxy-2-methylphthalimidine.

14. The compound of claim 1 which is 3-t-butyl-5-ethyl- 3-hydroxy-2-methylphthalimidine.

15. The compound of claim 1 which is 3 t butyl 5- chloro-2-ethyl-3-hydroxy.

16. The compound of claim 1 which is 3-t-butyl-4,5-dimethoxy-3-hydroxy-2-methylphthalirnidine.

. 17. The compound of claim 1 which is 3-(1-[1,1-cyclopentamethylene] ethyl -3-hydroxy-2-methylphth alimidine.

| R HOQ,

wherein R R R R R Q and the provisos are as defined in claim 1, or a non-toxic alkali metal salt thereof.

22. A compound of claim 1 having the formula,

wherein R R R R R Q and the provisos are as defined in claim 1, or a non-toxic acid addition salt thereof.

23. A compound of claim 1 having the formula,

R I R 2 Q wherein R R R R R Q and the provisos are as defined in claim 1, and Z is lower alkoxy.

24. A compound of claim 1 having the formula,

wherein R R R R R Q and the provisos are as defined in claim 1, and Z is wherein R and R as as defined in claim 1, or a nontoxic acid addition salt thereof.

References Cited UNITED STATES PATENTS 10/1958 Wheeler et al. 260325 OTHER REFERENCES Heidenbluth, Chem. Abs., vol. 64, 812223 (1966). Sekiya et al., Chem. Abs., v01. 70, 3488w (1969).

JOSEPH A. NARCAVAGE, Primary Examiner US. Cl. X.R. 

1. A COMPOUND OF THE FORMULA, 